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How to generate an alert when an asset is discovered

How do I generate an alert when a new asset is discovered? I have nmap running every hour and it does insert assets into the asset list, but I would like to generate an alarm or report of all the new assets discovered - implementing "Metric 1" of "Critical Control 1: Inventory of Authorized and Unauthorized Devices" (CSIS: 20 Critical Security Controls Version 4.0 - http://www.sans.org/critical-security-controls/)

"Control 1 Metric:

The system must be capable of identifying any new unauthorized devices that are connected to the network within 24 hours, and of alerting or sending e-mail notification to a list of enterprise administrative personnel."

OK - I think I may have missed something very basic. When I look at "policy and actions" I do not see any definitions, I only see a screen with two tabs "Policy", "Actions". Under the "Policy" tab I see two groups, but nothing is in either group.

The actions tab has the label "Actions No Actions", with the options "New", "Modify", and "Delete Selected"